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Create Heatmap Overlay Image

ThingSpeak™ helps you visualize your data by projecting measurements over an image or
map. This example illustrates creating a heatmap using the results from wireless network
signal strength measured by an ESP32 development board. You do not need special
hardware, but you need an image and position measurements. For more information, see
Wireless Network Signal Strength with ESP32 in Arduino.

Collect your data. Save the X and Y coordinates and the signal strength in
separate vectors. You can read the data for signal strength from a ThingSpeak channel. Be sure to modify the CHANNEL_ID, READ_API_KEY, and
FIELD_NUMBER with the appropriate values from your channel. You can find your
channel ID on the top of the main page for your channel. You can find the API
key on the API Keys tab of your channel view.